Use of Difunctional Compounds During Rapid Steam Hydrolysis (Rash) Pretreatment
作者:
Jagdish Rughani,
Louis Wasson,
Lynn Prewitt,
Gary McGinnis,
期刊:
Journal of Wood Chemistry and Technology
(Taylor Available online 1992)
卷期:
Volume 12,
issue 1
页码: 79-90
ISSN:0277-3813
年代: 1992
DOI:10.1080/02773819208545051
出版商: Taylor & Francis Group
关键词: Pretreatment;RASH;steam;wood;catalyst;difunctional compounds;maleic anhydride;phthalic anhydride;isophthalic acid;terephthalic acid.
数据来源: Taylor
摘要:
Mixed hardwood chips were treated with difunctional compounds as catalysts to study the reaction of wood with steam. The Rapid Steam Hydrolysis (RASH) pretreatment process was used for steam treatment. The difunctional compounds studied were maleic anhydride, phthalic anhydride, isophthalic acid, and terephthalic acid at 1.5% concentration based on dry wood weight. RASH pretreatment was performed for one minute at 180°C, 200°, 220°C, 230°C, 240°C, and 260°C. These compounds strongly modified the RASH pretreated material, especially the physical structure. Overall recovery of the pretreated catalyzed and uncatalyzed solids decreased with an increase in RASH temperatures. Catalyst addition did not make a difference on the recovery of pretreated solids. Cellulose degradation increased with temperature for catalyzed systems. Hemicellulose solubilization and degradation were extremely sensitive to the type of catalyst and RASH temperatures. Almost all of the hemicellulose was lost at higher temperatures. Lignin losses did not appear to be affected by the addition of catalyst except at 260°C. Enzymatic rates were improved by addition of the catalysts, especially at the lower temperatures. The maleic anhydride gave the highest enzymatic rates at all temperatures, and phthalic anhydride gave the second highest. The water solubles generally followed the same trends as the enzymatic hydrolysis rates and increased with the addition of catalysts, especially maleic anhydride.
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